1. Sensor Data Collection Through Unmanned Aircraft Gateways
Andrew Jenkins, Daniel Henkel, Timothy X Brown
University of Colorado, Boulder
’07
March 14, 2007

2. AUGNet
Group 1
16cm
Group 2
241cm
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Ad hoc UAV Ground Network

3. Sensor Data Collection
Delay tolerant traffic!
SMS-3
Gateway-2
CDMA
Sensor-1
SMS-1
Sensor-2
SMS-2
Gateway-1
Sensor-3
Have sensors all on left side
Highlight ferrying to the right side SMS locations
Sparsely distributed sensors
Limited radio range, power
Multiple monitoring stations
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4. Implement sensor data collection Special gateway nodes the key
Overview
We combine:
A restricted form of delay tolerant networking (DTN);
Service discovery mechanisms
Implement sensor data collection
Special gateway nodes the key
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5. To deliver sensor events to monitor station
Problem
To deliver sensor events to monitor station
To deliver commands to sensors
Challenges
Sensors and monitors do not know each other
Links may be intermittent
End-to-end connectivity may never exist
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6. Why not Sensor Networks?
Events collected at base stations within network
Specialized addressing and routing
What if Monitor Station is elsewhere?
Monitor Station and sensor in different networks
Addressing?
Routing?
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7. Why not Ad Hoc Networks? Ad hoc networks: Does not solve
Peer-to-peer routing
Does not solve
Intermittent connectivity
Inter-networking
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8. Why not IP Networks? Traditional IP networks: Assumes
Route across network domains
Assumes
End-nodes can assume burden
End-to-end connectivity
Network-wide services always accessible
DNS
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9. Best network for each stage Special nodes at boundaries
Approach
Staged delivery
Best network for each stage
Special nodes at boundaries
External Network
SMS1
GW1
SMS2
Ad Hoc Network T1
GW2
External Network
Sensors
SMS3
GW3 T2
Sensors
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10. Network Overlay Model Network 1 Network 2 Network 3 MANET SMS Gateway
MANET
Sensor
SMS
Gateway
Terminus
Sensor
SMS
Gateway
SMS
Sensor
Sends to fixed address
Reliable Forwarding
NAPT
Multicast
GW Discovery
Custody Transfer
Reliable Forwarding
NAPT
Multicast
GW and SMS Discovery
Custody Transfer
Reliable Forwarding
SMS Discovery
Reliable Forwarding
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11. Network Stack
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12. Software Implementation
Click Modular Router
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13. Hardware Implementation
RTT 40ms, 15hrs sustained operation
Soekris SBC, embedded Gentoo Linux
Atheros miniPCI, Madwifi-ng driver
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14. Performance Results I
Loss Rate
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15. Performance Results II
DTNClock Demo
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16. Generic sensor data collection solution
Conclusions
Generic sensor data collection solution
Reliable (no need for end-to-end connectivity)
Hides complexity from end points
Can overlay many different networks
Working delay tolerant network
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17. henk@colorado.edu http://recuv.colorado.edu/
The End

18. Research & Engineering Center for Unmanned Vehicles (RECUV)
Research and Engineering Center for
Unmanned Vehicles
University of Colorado at Boulder
The Research and Engineering Center for Unmanned Vehicles at the University of Colorado at Boulder is a university, government, and industry partnership dedicated to advancing knowledge and capabilities in using unmanned vehicles for scientific experiments, collecting geospatial data, mitigation of natural and man-made disasters, and defense against terrorist and hostile military activities.
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